An optically advanced wide-angle prime, the Sigma 35mm f/1.4 DG HSM Art Lens mixes a comfortable focal length with an especially fast design. The bright f/1.4 maximum aperture helps to achieve shallow espandi... depth of field and selective focus effects, and also suits working in difficult lighting conditions. The optical layout incorporates both low dispersion and aspherical elements, which help to improve sharpness and clarity by controlling both spherical and chromatic aberrations.